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How to download the date from the ecu by using laptop
Uh, that's a really difficult question to answer, with the information (not) provided!
For those that can guide you hough the process, it's important you give information, such as -
a/ the vehicle(s) - year model, engine, ECU details if known.
b/ the hardware you have - usually a minimum of OBD2 cable, and often an intermediate device (dongle) to connect to the laptop and port.
c/ the devic you wish to use - in this case a laptop, but PC or Mac (some of the latter may not be supported)?
d/ the program you wish to use to access, and read, the DATA. Oh, and the laptop's OS and version may be important - some programs and OS don't work together properly.
e/ any other details you can think of that muight help them.